The NEC from KOBOLD is used for liquid levels which is easily monitored. The level control designs can be achieved with at least two floats, one works as minimum contactor and the other as the maximum contactor. This device is usable for applications where a magnetic level switch is not useful due to the danger of the float to come in contact with with dirt molecules or deposits. Relying on the shape of the float and the materials that used, energetic, hot, dirty or sticky media may also be monitored.